From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org>
Subject: Re: Performance of the Streams 'Read and 'Write
Date: Fri, 30 Oct 2009 12:12:18 -0700
Date: 2009-10-30T12:12:18-07:00 [thread overview]
Message-ID: <hcfdpo$p62$1@news.tornevall.net> (raw)
In-Reply-To: <0554a812-076a-4d89-8ec4-fcbc27e25804@v30g2000yqm.googlegroups.com>
Gautier write-only wrote:
> On 30 Okt., 01:39, "Jeffrey R. Carter"
> <spam.jrcarter....@spam.acm.org> wrote:
>
>> And if you overlay the Stream_Element_Array onto the Buffer, thus eliminating
>> the copying and the stream attribute operations?
>
> With an Unchecked_conversion ?
No, that still does a copy.
Type Buffer, as a simple array of bytes, should have Buffer'Component_Size =
Unsigned_8'Size by default; but you can specify it if you're paranoid. If you're
really paranoid, you can add a test that Unsigned_8'Size = Stream_Element'Size,
which you seem to be assuming. Then
procedure Put (B : in Buffer) is -- Terrible naming scheme.
subtype Buffer_Stream is Stream_Element_Array (1 .. B'Length);
S : Buffer_Stream;
for S'Address use B'Address;
pragma Import (Ada, S);
begin -- Put
Write (S);
end Put;
--
Jeff Carter
"I spun around, and there I was, face to face with a
six-year-old kid. Well, I just threw my guns down and
walked away. Little bastard shot me in the ass."
Blazing Saddles
40
next prev parent reply other threads:[~2009-10-30 19:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-29 23:29 Performance of the Streams 'Read and 'Write Gautier write-only
2009-10-30 0:39 ` Jeffrey R. Carter
2009-10-30 8:58 ` Gautier write-only
2009-10-30 19:12 ` Jeffrey R. Carter [this message]
2009-10-31 23:46 ` Gautier write-only
2009-11-01 21:38 ` Gautier write-only
2009-11-02 21:32 ` Randy Brukardt
2009-10-30 3:36 ` Georg Bauhaus
2009-10-30 9:13 ` Gautier write-only
2009-11-02 21:37 ` Randy Brukardt
2009-11-02 22:16 ` Gautier write-only
2009-10-30 13:40 ` Gautier write-only
2009-11-02 22:19 ` Gautier write-only
2009-11-17 12:57 ` Gautier write-only
2009-11-17 13:26 ` Ludovic Brenta
2009-11-17 20:19 ` Building GNAT on Windows (Was: Re: Performance of the Streams 'Read and 'Write) Tero Koskinen
2009-11-18 10:55 ` Gautier write-only
2009-11-26 13:23 ` Performance of the Streams 'Read and 'Write Gautier write-only
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